Answer:
Lord of Nobles; Duties and Obligations: Lord had to exercise his judicial powers over the people they ruled. The would report on crops, harvests, and finances.
Benefits: Ruled over masses of people on sets amount of land.
Skills Needed: Strong Leadership skills.
Knight; Duties and obligations: Required to serve and protect the Lord of Noble. They were required to fight for 40 days.
Benefits: Granted land from the Lord.
Skills Needed: Strength and Courage
Serfs/Peasants; Duties and obligations: To serve the lord, right under the knights.
Benefits: Food and water.
Skills Needed: Employability skills. They had to be reliable for work.